Ingot mold



A. B. KINZEL oct'. 1s, 1932.

INGOT MOLD Filed Oct. 27, 1930 6 zzV/VENTOR;

A Troie/v5 Ys.

Patented Oct. 18, 1932 UNITED STATES PA'TEN'E OFFICE AUGUSTUS B. KINZEL,OF BEECHHUIRST, NEW YORK, ASSIGNOR TO ELECTRO METAL- LURGICAL COMPANY,A. CORPORATION OF WEST VIRGINIA meer Mori) Application filed Uctober 27,1930. Serial No. 491,489.

This invention relates to molds for casting ingots, and has applicationto a particular typeof improved ingot mold especially 'adapted forcasting so-called piping steels.

Due to the natural shrinkage of molten metal while cooling in a mold,many diiculties are encountered in attempting to form sound steelingots. Among the most coinmon defects is that caused by piping. Thisconsists in the formation of cavities -or fissures within the interiorof the ingot. The surfaces of these cavities usually become oxi,- dized,and if the ingot is worked without removing them, defects will appear inthe finished steel. Vith the usual forni of ingot mold it is impossibleto control the particular point within the ingot where the pipe mayoccur although itis usually found in the upper portion. It is thereforecustomary to cut off and discard that section of the ingot containingany pipe, before subsequently working it. In most instances this resultsin a waste of a considerable portion of the ingot.

An object of my invention is to provide an improved ingot mold havingmeans therein vfor confining or concentrating the shrinkage cavities toa comparatively small portion of the ingot, which portion is so definedas to permit its easy removal and produce a greater yield of soundworkable metal.

The advantages of my mold will be evident `from a description of theaccompanying drawing illustrating one form of a suitable Aingot moldembodying the invention.

Fig. 1 is a vertical cross section through the center of the mold.

Fig. 2 is a section on the line II.-II of Fig. 1.

In the modification shown the outer wall 2 of the mold is substantiallysquare in cross section and tapered toward the top. This wall resemblesin shape the common form of ingot mold, and is preferably-made of castiron. The four vertical dividing walls 3 eX- tend the entire length ofthe ingot. Each side of the outer wall carries one inner vertical wallwhich is centrally disposed thereon and extends toward the cent-er ofthe mold. The inner walls are detachably mounted to the outer walls bymeans of the rods 4 and the nuts 5, the rods 4 being connected with thereinforcing members 6. The material of the walls 3 should have less heatconducting capacity than the outer cast iron walls. I pre- It will benoted that there is a free and unl obstructed central opening runningthrough-- out the entire length of the mold. The molten metal isintroduced into t-lie mold with'the dividing walls in the positionshown, and, as the metal cools, the shrinkage cavities are confined tothe open central portion of the ingot mold. After the metal hassolidified the central section of the ingot is so delined that 1 t maybe easily separated from the rest of the ingot by breaking or cuttingoli' the outer portions to provide four sound blocks of steel. Thus theamount of steel wasted through discarding this comparatively smallcenter portion is much less than when large portions of the entire endof the ingot are removed, as is customary in normal practice forobtaining sound steel.

As previously stated the inner vertical walls are constructed of amaterial which is a poor conductor of heat. They, therefore, conductvery little heat away from the metal in the center of the mold, butrather act to cause that portion of the'metal to remain molten longerthan the rest. Since the pipe usually forms in that part of the metalwhich is the last to freeze, these inner walls act to confine the pipeformation in the open central portion of the ingot. In the particularposi# tion shown they also providey four sound blocks of steel,substantially square in cross section and of suitable shape for rolling.

Materials other than the one mentioned may be used for forming the innervertical walls, and various other modifications may also-be made,especially with regard to the outer shape of the mold and the particularpositioning of the inner walls, without departing from the spirit of myinvention.

I claim:

1. A. mold for casting ingots comprisin an outer wall and a plurality ofvertlcal d1- vidin walls of low heat conducting material exten in inwardfrom said outer walls toward t e center of the mold.

2. A mold for casting ingots comprisin an outer substantiallyrectangular wall, an a plurality of vertical dividing walls of low heatconducting material on said outer wall Y extending inwardly toward thecenter of the mold, but spaced therefrom to form an unobstructed centralsection throughout the entire length of the mold.

3. A mold for casting ingots comprising an outer wall substantiallysquare in cross section, having a, vertical dividing wall of low heatconducting material centrally dis osed and detachably mounted on eachside o said outer wall, said dividing Walls extending inwardly towardthe center of the mold but terminating short thereof.

4. A mold for casting steel ingots com rising `an outer cast iron wallsubstantiall square in cross section, having a vertical d1- vldin wallof low heat conducting refractory materlal centrally disposed anddetachably mounted on each side of said outer wall, said dividing wallsextending inwardly toward the center of the mold but terminating shortthereof to provide an unobstructed central section throughout the entirelength of the mold whereby shrinkage cavities within the ingot areconfined to that portion within said unobstructed central section'of themold.

In testimony whereof, I aix my signature.

AUGUSTUSl B. IUNZEL.

